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Transfert de chaleur et chute de pression lors de l’évaporation de R32 dans des tubes de petit diamètre de 4,0 mm.

Evaporation heat transfer and pressure drop of R32 inside small-diameter 4.0 mm tubes.

Numéro : pap. 2394

Auteurs : INOUE N., JIGE D., SAGAWA K.

Résumé

This paper presents an experimental study of the pressure drop and evaporation heat transfer characteristics of R32 inside two horizontal small-diameter microfin tubes. The geometric parameters of the test microfin tubes are an outer diameter of 4.0 mm, 25 and 40 fins, helix angles of 16° and 17°, and fin heights of 0.1 and 0.2 mm. The pressure drop and evaporation heat transfer characteristics are measured in a mass velocity range of 50–400 kg/(m2s) and a heat flux range of 5–20 kW/m2 at a saturation temperature of 15°C. The pressure drop and evaporation heat transfer coefficient increase with increasing fin height and number of fins. The pressure drop and evaporation heat transfer characteristics in the small-diameter microfin tubes are also compared with those in a small-diameter smooth tube used as a reference tube. The pressure drop and evaporation heat transfer coefficient of the smalldiameter microfin tubes are found to be, respectively, 1.1–2.0 and 1.3–6.5 times those of the small-diameter smooth tube having the same outer diameter.

Documents disponibles

Format PDF

Pages : 8 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Evaporation heat transfer and pressure drop of R32 inside small-diameter 4.0 mm tubes.
  • Identifiant de la fiche : 30018910
  • Langues : Anglais
  • Source : 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 11/07/2016

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